Performance of feedback fusion algorithms for point-to-multipoint ABR connections in a heterogeneous flow
Résumé
For ABR multicast (point-to-multipoint) flow, ATM Forum proposes to have fusion of feedbacks, coming from multiple destinations of the connection, at branch-points. For that matter, many fusion algorithms are proposed in the past for multicast ABR applications. In the conception of these fusion algorithms, the possible sharing of bandwidth by any unicast ABR flow on the same link has not been taken into account which makes the fusion algorithms lack in maintaining a service balance between unicast and multicast ABR flows and eventually the optimal utilization of available bandwidth is not attained. We solve these problems by employing, at switches, an arbitration algorithm, that observes the rate at which queues, for unicast as well as for multicast connections at an output port, are served and accordingly assigns them certain priority levels. The simulation results show that the service balance is maintained between unicast and multicast queues in accordance to their fair share and the utilization of link available bandwidth is improved.
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